Final answer:
Schlosser's work is investigative journalism because it involves in-depth, systematic research and the use of data and public records.
Step-by-step explanation:
Schlosser's work can be considered investigative journalism because it involves both in-depth, systematic use of original research (option A) and the use of data and public records (option B). Investigative journalism often involves reporters conducting extensive research over a period of time to uncover significant new information, and Schlosser's work fits this description. It does not involve sharing secret information (option C) and while there may be a strong emphasis on social justice and accountability (option D), this is not a defining characteristic of investigative journalism. Therefore, the correct answer is option E: Both A and D.